四元数的诞生,如同几何、代数、形而上学和诗歌这四位父母的奇特后代。
你必须相信过程并相信自己,即使事情没有按照你的方式进行。
"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors."
They are not monuments, but footprints. A monument only says, 'At least I got this far,' while a footprint says, 'This is where I was when I moved again.'